Do you own a Detroit Diesel Series 60 engine? It probably runs well for the most part. All three versions of this electronically-controlled engine have a favorable reputation; despite being out of production for years, the Series 60 remains a popular choice for many truck drivers.
Despite having a well-received reputation and a popularity that’s endured decades, this engine still has its share of issues, as any other engine would. We’ll explore some of the most common problems surrounding Detroit Series 60 engines. Below isn’t an exhaustive list of every engine problem, but if you notice your engine isn’t working like it used to, these issues are ones to watch out for.
Diving Into the Problems
We’ve already skimmed some of these issues in our Detroit Series 60 spotlight, but we’ll cover them more extensively here. Some of these issues are also mentioned in It Still Runs.
Cold Starts
Cold starts –starting your engine in cool temperatures– can cause trouble for Series 60 engines. They might lose their prime and not start properly. You can combat this issue using a starting fluid, and once the engine gets running, you shouldn’t run into any other problems. You can also alleviate this issue by changing the SRS (Synchronous Reference Sensor) and TRS (Timing Reference Sensor). If you want your engine to function well both sensors should be replaced simultaneously.
Defective Wrist Pin
This particular issue pops up in Detroit Series 60 engines built before 2002. It’s not present in every pre-2002 Series 60 engine, but when it does show up it can cause catastrophic engine failure. There’s a defect in some of the wrist pins causing the piston pin and crown to separate. This separation then caused the connection rod to get loose, and one of these loose components would damage the engine block, usually punching a hole through it.
Cooling System
It’s usually a good idea to closely watch your engine’s coolant system. Overheating is a major issue with almost any diesel engine, and maintaining a proper coolant system can prevent plenty of problems.
Throttle Problems
This is an uncommon issue that usually shows up in engines with certain kinds of aftermarket engine brakes installed. These aftermarket brakes require different programming than what’s standard on the Series 60, and this disconnect can cause throttle loss. If this doesn’t apply to you, or you’re still experiencing throttle issues, check out your TPS (throttle position sensor). This sensor works with your electronic control system in drive-by-wire applications like Series 60 engines. If there are any throttle issues, the TPS is a good place to start.
Bearing Issues
Bearing problems, particularly spun bearing problems, are caused by older Series 60 having low oil pressure during idle. A spun bearing happens when a lack of lubrication causes overheating. The bearing might eventually seize, creating further problems. Low oil pressure at idle is a common complaint in these older Series 60 models. If you have one, watch your lower bearings and check for proper lubrication.
EGR Problems
The later Series 60 Detroit engines use an EGR to lower NOx emissions. This EGR system, especially the EGR cooler, is frequently blamed for engine issues. EGR cooler issues usually cause an exhaust leak, especially white exhaust. If you have an exhaust leak, you’ll probably notice lower coolant issues in your engine, but otherwise, things might appear normal. This leak can cause your engine to overheat.
Operators often experience EGR system issues on their 14L Series 60 in particular.
Fuel Economy
Another common complaint, especially in the 14L engines, is poor fuel economy. As the engine grew larger and was designed for greater horsepower, fuel consumption seemingly increased alongside it. Some owners argue that lower fuel economy isn’t caused by the engine’s design but by poor operating practices. If you’re experiencing poor fuel economy ensure you’re not constantly running your engine at a high RPM.
Some of these issues are more common than others, but they’re all problems to watch out for when running a Series 60 Detroit engine. Preventive maintenance can go a long way in avoiding issues.
Is A 60 Series Detroit Diesel A Good Engine?
Detroit Diesel’s Series 60 engines are incredibly popular and well-renowned in the diesel community. The Series 60 ranked second best diesel engine ever in the “Best Diesel Engine Ever” list compiled by Diesel Power Magazine. It has the distinction of being the most popular heavy-duty diesel engine in North America since 1992. That’s saying something!
FAQs for the Detroit Diesel Series 60 Engine Issues
1. How can I resolve cold start problems on a Series 60 engine?
Cold starts in cooler temperatures can cause the Series 60 to lose its prime and fail to start. Using a high‑quality starting fluid can help get the engine running. Simultaneously replace both the SRS (Synchronous Reference Sensor) and TRS (Timing Reference Sensor) to restore reliable cold‑start performance.
2. What is the defective wrist pin issue and which Series 60 models are affected?
Some pre‑2002 Series 60 engines have a wrist pin defect where the piston pin separates from the crown, allowing the connecting rod to puncture the block. This catastrophic failure only occurs on certain early builds and is prevented by using updated wrist pin designs.
3. How should I maintain the cooling system to prevent overheating?
Regularly inspect coolant level, hoses and the radiator for leaks or blockages. Flush and replace coolant per manufacturer intervals, and verify the water pump and thermostat operate correctly. Proper cooling maintenance prevents the overheating issues common on any diesel engine.
4. What causes bearing issues on older Series 60 engines and how can I prevent them?
Older Series 60 models often suffer spun bearings due to low oil pressure at idle, causing lubrication starvation and overheating. Prevent this by maintaining proper oil level and viscosity, avoiding prolonged idling, and servicing oil galleries and filters regularly.
5. How do EGR cooler failures manifest and what are the symptoms?
EGR cooler leaks lead to white exhaust smoke, exhaust leaks around the cooler, and low coolant levels without visible external damage. Symptoms include overheating, loss of coolant and reduced engine efficiency. Inspect the EGR cooler and replace any cracked or leaking components.
